Duramax ARP Main Studs [ARP230-5402]

ARP offers a main stud kit for LB7/LLY applications as well as LBZ applications. The difference is only the overall length of the stud. The LBZ studs are approx 5 mm longer. The reason for that is the holes are tapped deeper in a LBZ block. We stock the LBZ studs and regularly use them in all model year engines. In early engines, the studs will stick up a bit further but presents absolutely no problem at all. This also allows for the block to be tapped deeper if the assembler chooses to do so.